Final answer:
Provitamins are substances found in foods that need to be converted into active vitamins by the body. Preformed vitamins are already in an active form. Fat-soluble vitamins dissolve in fat and can be stored, while water-soluble vitamins do not get stored in large amounts.
Step-by-step explanation:
Provitamins are substances found in foods that are not in a form directly usable by the body as a vitamin. They are converted into active vitamins by the body through various metabolic processes.
Preformed vitamins, on the other hand, are already in an active form and can be used directly by the body without any further metabolic conversion.
Fat-soluble vitamins (such as vitamins A, D, E, and K) dissolve in fat and are stored in the body's fatty tissues. Water-soluble vitamins (such as vitamins B and C) dissolve in water and are not stored in large amounts in the body. They need to be replenished regularly.
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